SELECT 
  f.feature_id, 
  f.purpose, 
  p.product_id, 
  p.parent_product_id, 
  g.id, 
  g.code 
FROM 
  cscart_product_variation_group_features AS f 
  INNER JOIN cscart_product_variation_groups AS g ON f.group_id = g.id 
  INNER JOIN cscart_product_variation_group_products AS p ON f.group_id = p.group_id 
WHERE 
  p.product_id IN (
    1626, 2281, 2282, 2283, 2284, 2285, 2331, 
    2332, 2333, 2334, 2335, 2403, 2404, 
    2405, 2406, 2407, 2408, 2409, 2410, 
    2411, 2599, 2600, 2601, 2602, 5881, 
    5882, 5883, 5884, 5931, 5932, 5933, 
    5934, 6003, 6004, 6005, 6006, 6007, 
    6008, 6009, 6010, 6011, 6192, 6193, 
    6194, 6195, 2595, 2596, 2597, 2598, 
    6187, 6188, 6189, 6190, 2730, 2731, 
    2732, 2733, 2734, 6318, 6319, 6320, 
    6321, 2726, 2727, 2728, 2729, 6313, 
    6314, 6315, 6316, 6317, 1573, 1574, 
    1575, 1576, 1577, 1578, 1579, 1580, 
    1581, 1582, 1583, 1584, 1585, 1586, 
    1587, 1588, 1589, 1590, 1591, 1592, 
    1593, 1594, 1595, 1596, 1597
  )

Query time 0.00071

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "201.61"
    },
    "nested_loop": [
      {
        "table": {
          "table_name": "p",
          "access_type": "range",
          "possible_keys": [
            "PRIMARY",
            "idx_group_id"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "product_id"
          ],
          "key_length": "3",
          "rows_examined_per_scan": 96,
          "rows_produced_per_join": 96,
          "filtered": "100.00",
          "index_condition": "(`gaseus`.`p`.`product_id` in (1626,2281,2282,2283,2284,2285,2331,2332,2333,2334,2335,2403,2404,2405,2406,2407,2408,2409,2410,2411,2599,2600,2601,2602,5881,5882,5883,5884,5931,5932,5933,5934,6003,6004,6005,6006,6007,6008,6009,6010,6011,6192,6193,6194,6195,2595,2596,2597,2598,6187,6188,6189,6190,2730,2731,2732,2733,2734,6318,6319,6320,6321,2726,2727,2728,2729,6313,6314,6315,6316,6317,1573,1574,1575,1576,1577,1578,1579,1580,1581,1582,1583,1584,1585,1586,1587,1588,1589,1590,1591,1592,1593,1594,1595,1596,1597))",
          "cost_info": {
            "read_cost": "57.61",
            "eval_cost": "9.60",
            "prefix_cost": "67.21",
            "data_read_per_join": "1K"
          },
          "used_columns": [
            "product_id",
            "parent_product_id",
            "group_id"
          ]
        }
      },
      {
        "table": {
          "table_name": "g",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "id"
          ],
          "key_length": "3",
          "ref": [
            "gaseus.p.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 96,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "24.00",
            "eval_cost": "9.60",
            "prefix_cost": "100.81",
            "data_read_per_join": "37K"
          },
          "used_columns": [
            "id",
            "code"
          ]
        }
      },
      {
        "table": {
          "table_name": "f",
          "access_type": "ref",
          "possible_keys": [
            "idx_group_id"
          ],
          "key": "idx_group_id",
          "used_key_parts": [
            "group_id"
          ],
          "key_length": "3",
          "ref": [
            "gaseus.p.group_id"
          ],
          "rows_examined_per_scan": 3,
          "rows_produced_per_join": 288,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "72.00",
            "eval_cost": "28.80",
            "prefix_cost": "201.61",
            "data_read_per_join": "29K"
          },
          "used_columns": [
            "feature_id",
            "purpose",
            "group_id"
          ]
        }
      }
    ]
  }
}