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 (
    5032, 5028, 5030, 5029, 5036, 5461, 5458, 
    5328, 5047, 5365, 5033, 5456, 5596, 
    5367, 5500, 5054, 5335, 5504, 5506, 
    5464, 5508, 6081, 6144, 6083, 6189, 
    6145, 5644, 6297, 6190, 6276, 6303, 
    6260, 6305, 6274, 6301, 6824, 6825
  )

Query time 0.00103

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "54.11"
    },
    "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": 39,
          "rows_produced_per_join": 39,
          "filtered": "100.00",
          "index_condition": "(`softwarepirmam_hewadelivard_cscart_4`.`p`.`product_id` in (5032,5028,5030,5029,5036,5461,5458,5328,5047,5365,5033,5456,5596,5367,5500,5054,5335,5504,5506,5464,5508,6081,6144,6083,6189,6145,5644,6297,6190,6276,6303,6260,6305,6274,6301,6824,6825))",
          "cost_info": {
            "read_cost": "22.91",
            "eval_cost": "3.90",
            "prefix_cost": "26.81",
            "data_read_per_join": "624"
          },
          "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": 39,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "9.75",
            "eval_cost": "3.90",
            "prefix_cost": "40.46",
            "data_read_per_join": "15K"
          },
          "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": 39,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "9.75",
            "eval_cost": "3.90",
            "prefix_cost": "54.11",
            "data_read_per_join": "3K"
          },
          "used_columns": [
            "feature_id",
            "purpose",
            "group_id"
          ]
        }
      }
    ]
  }
}