SELECT 
  COUNT(
    DISTINCT(jmj_companies.company_id)
  ) 
FROM 
  jmj_companies 
  LEFT JOIN jmj_company_descriptions as company_descr ON company_descr.company_id = jmj_companies.company_id 
  AND company_descr.lang_code = 'en' 
  LEFT JOIN jmj_company_descriptions ON jmj_company_descriptions.company_id = jmj_companies.company_id 
  AND jmj_company_descriptions.lang_code = 'en' 
  LEFT JOIN jmj_absolute_rating AS absolute_rating ON absolute_rating.object_id = jmj_companies.company_id 
  AND absolute_rating.object_type = 'company' 
  LEFT JOIN jmj_vendor_plan_descriptions ON jmj_companies.plan_id = jmj_vendor_plan_descriptions.plan_id 
  AND jmj_vendor_plan_descriptions.lang_code = 'en' 
  LEFT JOIN jmj_discussion ON jmj_discussion.object_id = jmj_companies.company_id 
  AND jmj_discussion.object_type = 'M' 
  LEFT JOIN jmj_discussion_posts ON jmj_discussion_posts.thread_id = jmj_discussion.thread_id 
  AND jmj_discussion_posts.status = 'A' 
  LEFT JOIN jmj_discussion_rating ON jmj_discussion.thread_id = jmj_discussion_rating.thread_id 
  AND jmj_discussion_rating.post_id = jmj_discussion_posts.post_id 
WHERE 
  1 
  AND jmj_companies.status = 'A'

Query time 0.00138

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "68.53"
    },
    "nested_loop": [
      {
        "table": {
          "table_name": "jmj_companies",
          "access_type": "ALL",
          "rows_examined_per_scan": 35,
          "rows_produced_per_join": 3,
          "filtered": "10.00",
          "cost_info": {
            "read_cost": "11.30",
            "eval_cost": "0.70",
            "prefix_cost": "12.00",
            "data_read_per_join": "37K"
          },
          "used_columns": [
            "company_id",
            "status",
            "plan_id"
          ],
          "attached_condition": "(`jmj_test`.`jmj_companies`.`status` = 'A')"
        }
      },
      {
        "table": {
          "table_name": "company_descr",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "company_id",
            "lang_code"
          ],
          "key_length": "10",
          "ref": [
            "jmj_test.jmj_companies.company_id",
            "const"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 3,
          "filtered": "100.00",
          "using_index": true,
          "cost_info": {
            "read_cost": "3.50",
            "eval_cost": "0.70",
            "prefix_cost": "16.20",
            "data_read_per_join": "6K"
          },
          "used_columns": [
            "company_id",
            "lang_code"
          ]
        }
      },
      {
        "table": {
          "table_name": "jmj_company_descriptions",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "company_id",
            "lang_code"
          ],
          "key_length": "10",
          "ref": [
            "jmj_test.jmj_companies.company_id",
            "const"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 3,
          "filtered": "100.00",
          "using_index": true,
          "cost_info": {
            "read_cost": "3.50",
            "eval_cost": "0.70",
            "prefix_cost": "20.40",
            "data_read_per_join": "6K"
          },
          "used_columns": [
            "company_id",
            "lang_code"
          ]
        }
      },
      {
        "table": {
          "table_name": "absolute_rating",
          "access_type": "index",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "object_id",
            "object_type"
          ],
          "key_length": "102",
          "rows_examined_per_scan": 2,
          "rows_produced_per_join": 7,
          "filtered": "100.00",
          "using_index": true,
          "using_join_buffer": "Block Nested Loop",
          "cost_info": {
            "read_cost": "2.01",
            "eval_cost": "1.40",
            "prefix_cost": "23.81",
            "data_read_per_join": "784"
          },
          "used_columns": [
            "object_id",
            "object_type"
          ],
          "attached_condition": "<if>(is_not_null_compl(absolute_rating), ((`jmj_test`.`absolute_rating`.`object_id` = `jmj_test`.`jmj_companies`.`company_id`) and (`jmj_test`.`absolute_rating`.`object_type` = 'company')), true)"
        }
      },
      {
        "table": {
          "table_name": "jmj_vendor_plan_descriptions",
          "access_type": "index",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "plan_id",
            "lang_code"
          ],
          "key_length": "10",
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 7,
          "filtered": "100.00",
          "using_index": true,
          "using_join_buffer": "Block Nested Loop",
          "cost_info": {
            "read_cost": "2.01",
            "eval_cost": "1.40",
            "prefix_cost": "27.23",
            "data_read_per_join": "5K"
          },
          "used_columns": [
            "plan_id",
            "lang_code"
          ],
          "attached_condition": "<if>(is_not_null_compl(jmj_vendor_plan_descriptions), ((`jmj_test`.`jmj_vendor_plan_descriptions`.`plan_id` = `jmj_test`.`jmj_companies`.`plan_id`) and (`jmj_test`.`jmj_vendor_plan_descriptions`.`lang_code` = 'en')), true)"
        }
      },
      {
        "table": {
          "table_name": "jmj_discussion",
          "access_type": "eq_ref",
          "possible_keys": [
            "object_id"
          ],
          "key": "object_id",
          "used_key_parts": [
            "object_id",
            "object_type"
          ],
          "key_length": "6",
          "ref": [
            "jmj_test.jmj_companies.company_id",
            "const"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 7,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "3.50",
            "eval_cost": "1.40",
            "prefix_cost": "32.13",
            "data_read_per_join": "168"
          },
          "used_columns": [
            "thread_id",
            "object_id",
            "object_type"
          ],
          "attached_condition": "<if>(is_not_null_compl(jmj_discussion), (`jmj_test`.`jmj_discussion`.`object_id` = `jmj_test`.`jmj_companies`.`company_id`), true)"
        }
      },
      {
        "table": {
          "table_name": "jmj_discussion_posts",
          "access_type": "ref",
          "possible_keys": [
            "thread_id",
            "thread_id_2"
          ],
          "key": "thread_id",
          "used_key_parts": [
            "thread_id"
          ],
          "key_length": "3",
          "ref": [
            "jmj_test.jmj_discussion.thread_id"
          ],
          "rows_examined_per_scan": 3,
          "rows_produced_per_join": 21,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "17.50",
            "eval_cost": "4.20",
            "prefix_cost": "53.83",
            "data_read_per_join": "9K"
          },
          "used_columns": [
            "post_id",
            "thread_id",
            "status"
          ],
          "attached_condition": "<if>(is_not_null_compl(jmj_discussion_posts), (`jmj_test`.`jmj_discussion_posts`.`status` = 'A'), true)"
        }
      },
      {
        "table": {
          "table_name": "jmj_discussion_rating",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY",
            "thread_id"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "post_id"
          ],
          "key_length": "3",
          "ref": [
            "jmj_test.jmj_discussion_posts.post_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 21,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "10.50",
            "eval_cost": "4.20",
            "prefix_cost": "68.53",
            "data_read_per_join": "336"
          },
          "used_columns": [
            "post_id",
            "thread_id"
          ],
          "attached_condition": "<if>(is_not_null_compl(jmj_discussion_rating), (`jmj_test`.`jmj_discussion_rating`.`thread_id` = `jmj_test`.`jmj_discussion`.`thread_id`), true)"
        }
      }
    ]
  }
}