SELECT 
  v.variant_id, 
  v.product_id, 
  vd.variant, 
  vf.position, 
  vf.color 
FROM 
  cscart_product_features_values v 
  LEFT JOIN cscart_product_feature_variant_descriptions vd ON v.variant_id = vd.variant_id 
  AND vd.lang_code = 'en' 
  LEFT JOIN cscart_product_feature_variants vf ON v.variant_id = vf.variant_id 
WHERE 
  1 
  AND v.feature_id = 1393 
  AND v.product_id IN (
    '19102', '55711', '55712', '55713', 
    '55714', '55715', '55716', '55717', 
    '55718', '55719', '55720', '55721', 
    '55722', '55723', '55724', '55725', 
    '55726', '55727', '55728', '55729', 
    '55730', '55731', '55732', '55733', 
    '55734', '55735', '55736', '55737', 
    '55738', '55739', '55740', '55741', 
    '55742', '55743', '55744', '55745', 
    '55746', '55747', '55748', '55749', 
    '55750', '55751', '55752', '55753', 
    '55754', '55755', '55756', '55757', 
    '55758', '55759', '55760', '55761', 
    '55762', '55763', '55764', '55765', 
    '55766', '55767', '55768', '55769'
  )

Query time 0.00234

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "54.85"
    },
    "nested_loop": [
      {
        "table": {
          "table_name": "v",
          "access_type": "range",
          "possible_keys": [
            "PRIMARY",
            "fl",
            "product_id",
            "fpl",
            "idx_product_feature_variant_id"
          ],
          "key": "idx_product_feature_variant_id",
          "used_key_parts": [
            "product_id",
            "feature_id"
          ],
          "key_length": "6",
          "rows_examined_per_scan": 60,
          "rows_produced_per_join": 60,
          "filtered": "100.00",
          "using_index": true,
          "cost_info": {
            "read_cost": "6.85",
            "eval_cost": "6.00",
            "prefix_cost": "12.85",
            "data_read_per_join": "46K"
          },
          "used_columns": [
            "feature_id",
            "product_id",
            "variant_id"
          ],
          "attached_condition": "((`cscartdb`.`v`.`feature_id` = 1393) and (`cscartdb`.`v`.`product_id` in ('19102','55711','55712','55713','55714','55715','55716','55717','55718','55719','55720','55721','55722','55723','55724','55725','55726','55727','55728','55729','55730','55731','55732','55733','55734','55735','55736','55737','55738','55739','55740','55741','55742','55743','55744','55745','55746','55747','55748','55749','55750','55751','55752','55753','55754','55755','55756','55757','55758','55759','55760','55761','55762','55763','55764','55765','55766','55767','55768','55769')))"
        }
      },
      {
        "table": {
          "table_name": "vd",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "variant_id",
            "lang_code"
          ],
          "key_length": "9",
          "ref": [
            "cscartdb.v.variant_id",
            "const"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 60,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "15.00",
            "eval_cost": "6.00",
            "prefix_cost": "33.85",
            "data_read_per_join": "181K"
          },
          "used_columns": [
            "variant_id",
            "variant",
            "lang_code"
          ]
        }
      },
      {
        "table": {
          "table_name": "vf",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "variant_id"
          ],
          "key_length": "3",
          "ref": [
            "cscartdb.v.variant_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 60,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "15.00",
            "eval_cost": "6.00",
            "prefix_cost": "54.85",
            "data_read_per_join": "68K"
          },
          "used_columns": [
            "variant_id",
            "color",
            "position"
          ]
        }
      }
    ]
  }
}