SELECT 
  pfv.feature_id, 
  pfv.product_id, 
  pfv.variant_id, 
  gp.group_id 
FROM 
  cscart_product_features_values AS pfv 
  INNER JOIN cscart_product_variation_group_products AS gp ON pfv.product_id = gp.product_id 
  INNER JOIN cscart_product_variation_group_features AS gpf ON gpf.group_id = gp.group_id 
  AND gpf.feature_id = pfv.feature_id 
WHERE 
  pfv.lang_code = 'en' 
  AND gp.group_id IN (
    9237, 9233, 7568, 9234, 9803, 9799, 9797, 
    10687, 9244, 9789, 9248, 9242, 10690, 
    9801, 10695, 7607, 7569, 7579, 10688, 
    7567, 9236, 9790, 9802, 9807, 10703, 
    9806, 7559, 9798, 9793, 10693, 9240, 
    9800, 10700, 7598, 9243, 7600, 9239, 
    10686, 9247, 7602, 10694, 9786, 9809, 
    9787, 9804, 9811, 9235, 10692, 9241, 
    7571, 9788, 7560, 9792, 9245, 10696, 
    9791, 7562, 9238, 9816, 9817, 9815, 
    8412, 8349, 8382
  )

Query time 0.00869

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "1083.46"
    },
    "nested_loop": [
      {
        "table": {
          "table_name": "gpf",
          "access_type": "range",
          "possible_keys": [
            "PRIMARY",
            "idx_group_id"
          ],
          "key": "idx_group_id",
          "used_key_parts": [
            "group_id"
          ],
          "key_length": "3",
          "rows_examined_per_scan": 74,
          "rows_produced_per_join": 74,
          "filtered": "100.00",
          "using_index": true,
          "cost_info": {
            "read_cost": "15.89",
            "eval_cost": "14.80",
            "prefix_cost": "30.69",
            "data_read_per_join": "7K"
          },
          "used_columns": [
            "feature_id",
            "group_id"
          ],
          "attached_condition": "(`webmarco`.`gpf`.`group_id` in (9237,9233,7568,9234,9803,9799,9797,10687,9244,9789,9248,9242,10690,9801,10695,7607,7569,7579,10688,7567,9236,9790,9802,9807,10703,9806,7559,9798,9793,10693,9240,9800,10700,7598,9243,7600,9239,10686,9247,7602,10694,9786,9809,9787,9804,9811,9235,10692,9241,7571,9788,7560,9792,9245,10696,9791,7562,9238,9816,9817,9815,8412,8349,8382))"
        }
      },
      {
        "table": {
          "table_name": "gp",
          "access_type": "ref",
          "possible_keys": [
            "PRIMARY",
            "idx_group_id"
          ],
          "key": "idx_group_id",
          "used_key_parts": [
            "group_id"
          ],
          "key_length": "3",
          "ref": [
            "webmarco.gpf.group_id"
          ],
          "rows_examined_per_scan": 9,
          "rows_produced_per_join": 698,
          "filtered": "100.00",
          "using_index": true,
          "cost_info": {
            "read_cost": "74.69",
            "eval_cost": "139.73",
            "prefix_cost": "245.10",
            "data_read_per_join": "10K"
          },
          "used_columns": [
            "product_id",
            "group_id"
          ]
        }
      },
      {
        "table": {
          "table_name": "pfv",
          "access_type": "ref",
          "possible_keys": [
            "PRIMARY",
            "fl",
            "lang_code",
            "product_id",
            "fpl",
            "idx_product_feature_variant_id"
          ],
          "key": "fpl",
          "used_key_parts": [
            "feature_id",
            "product_id",
            "lang_code"
          ],
          "key_length": "12",
          "ref": [
            "webmarco.gpf.feature_id",
            "webmarco.gp.product_id",
            "const"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 698,
          "filtered": "100.00",
          "using_index": true,
          "cost_info": {
            "read_cost": "698.63",
            "eval_cost": "139.73",
            "prefix_cost": "1083.46",
            "data_read_per_join": "540K"
          },
          "used_columns": [
            "feature_id",
            "product_id",
            "variant_id",
            "lang_code"
          ]
        }
      }
    ]
  }
}