SELECT 
  * 
FROM 
  jmj_product_feature_variants 
WHERE 
  variant_id IN (
    3246, 3247, 2103, 2104, 2112, 2117, 2119, 
    2121, 2129, 2133, 2137, 2143, 2182, 
    2201, 2202, 2204, 2205, 2209, 2211, 
    2229, 2231, 2232, 2237, 2238, 2239, 
    3238, 766
  )

Query time 0.00068

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "64.81"
    },
    "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": 27,
      "rows_produced_per_join": 27,
      "filtered": "100.00",
      "index_condition": "(`jmj_test`.`jmj_product_feature_variants`.`variant_id` in (3246,3247,2103,2104,2112,2117,2119,2121,2129,2133,2137,2143,2182,2201,2202,2204,2205,2209,2211,2229,2231,2232,2237,2238,2239,3238,766))",
      "cost_info": {
        "read_cost": "59.41",
        "eval_cost": "5.40",
        "prefix_cost": "64.81",
        "data_read_per_join": "41K"
      },
      "used_columns": [
        "variant_id",
        "feature_id",
        "url",
        "color",
        "position",
        "abt__ut2_color_style",
        "abt__ut2_multicolor"
      ]
    }
  }
}