SELECT 
  * 
FROM 
  jmj_product_feature_variants 
WHERE 
  variant_id IN (
    3246, 3247, 2112, 2137, 2149, 2155, 2165, 
    2193, 2200, 2211, 2220, 2239, 766
  )

Query time 0.01116

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "31.21"
    },
    "table": {
      "table_name": "jmj_product_feature_variants",
      "access_type": "range",
      "possible_keys": [
        "PRIMARY"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "variant_id"
      ],
      "key_length": "3",
      "rows_examined_per_scan": 13,
      "rows_produced_per_join": 13,
      "filtered": "100.00",
      "index_condition": "(`jmj_test`.`jmj_product_feature_variants`.`variant_id` in (3246,3247,2112,2137,2149,2155,2165,2193,2200,2211,2220,2239,766))",
      "cost_info": {
        "read_cost": "28.61",
        "eval_cost": "2.60",
        "prefix_cost": "31.21",
        "data_read_per_join": "20K"
      },
      "used_columns": [
        "variant_id",
        "feature_id",
        "url",
        "color",
        "position",
        "abt__ut2_color_style",
        "abt__ut2_multicolor"
      ]
    }
  }
}

Result

variant_id feature_id url color position abt__ut2_color_style abt__ut2_multicolor
766 132 #ffffff 1 default
2112 280 #191970 52 default
2137 280 #48d1cc 137 default
2149 280 #228b22 180 default
2155 280 #00ff7f 217 default
2165 280 #fffacd 243 default
2193 280 #ff7f50 364 default
2200 280 #ff4500 380 default
2211 280 #ff69b4 449 default
2220 280 #7b68ee 488 default
2239 280 #ffffff 554 default
3246 31 #ffffff 130 default
3247 31 #ffffff 131 default