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 (
    2771, 4992, 5661, 2774, 2455, 5207, 5737, 
    6385, 5186, 5008, 1517, 4991, 5272, 
    2438, 5276, 8498, 5660, 7624, 8484, 
    8497, 5285, 5346, 2812, 5728, 7608, 
    5879, 2250, 8485, 1538, 5265, 8488, 
    8486, 8492, 2899, 5288, 8487, 5523, 
    7614, 5666, 6823
  )

Query time 0.00117

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "59.46"
    },
    "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": 43,
          "rows_produced_per_join": 43,
          "filtered": "100.00",
          "index_condition": "(`softwarepirmam_hewadelivard_cscart_4`.`p`.`product_id` in (2771,4992,5661,2774,2455,5207,5737,6385,5186,5008,1517,4991,5272,2438,5276,8498,5660,7624,8484,8497,5285,5346,2812,5728,7608,5879,2250,8485,1538,5265,8488,8486,8492,2899,5288,8487,5523,7614,5666,6823))",
          "cost_info": {
            "read_cost": "25.06",
            "eval_cost": "4.30",
            "prefix_cost": "29.36",
            "data_read_per_join": "688"
          },
          "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": [
            "softwarepirmam_hewadelivard_cscart_4.p.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 43,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "10.75",
            "eval_cost": "4.30",
            "prefix_cost": "44.41",
            "data_read_per_join": "16K"
          },
          "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": [
            "softwarepirmam_hewadelivard_cscart_4.p.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 43,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "10.75",
            "eval_cost": "4.30",
            "prefix_cost": "59.46",
            "data_read_per_join": "4K"
          },
          "used_columns": [
            "feature_id",
            "purpose",
            "group_id"
          ]
        }
      }
    ]
  }
}