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 (
    7724, 7725, 7722, 7659, 7719, 7742, 7767, 
    7655, 7657, 7736, 7737, 7769, 7770, 
    7656, 7658, 7716, 7718, 7720, 7721, 
    7723, 7726, 7766, 7768, 7733, 9276, 
    9277, 9279, 9278
  )

Query time 0.00233

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "39.21"
    },
    "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": 28,
          "rows_produced_per_join": 28,
          "filtered": "100.00",
          "index_condition": "(`softwarepirmam_hewadelivard_cscart_4`.`p`.`product_id` in (7724,7725,7722,7659,7719,7742,7767,7655,7657,7736,7737,7769,7770,7656,7658,7716,7718,7720,7721,7723,7726,7766,7768,7733,9276,9277,9279,9278))",
          "cost_info": {
            "read_cost": "16.81",
            "eval_cost": "2.80",
            "prefix_cost": "19.61",
            "data_read_per_join": "448"
          },
          "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": 28,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "7.00",
            "eval_cost": "2.80",
            "prefix_cost": "29.41",
            "data_read_per_join": "10K"
          },
          "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": 28,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "7.00",
            "eval_cost": "2.80",
            "prefix_cost": "39.21",
            "data_read_per_join": "2K"
          },
          "used_columns": [
            "feature_id",
            "purpose",
            "group_id"
          ]
        }
      }
    ]
  }
}