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 (
    2698, 3605, 5830, 2340, 5887, 3155, 3834, 
    2737, 3306, 5848, 2352, 2431, 5114, 
    2339, 3389, 2924, 1626, 3350, 3392, 
    5811, 3390, 2922, 5849, 5798, 3603, 
    2693, 2338, 5826, 5801, 5864, 5829, 
    3301, 5852, 5928, 5822, 5847, 5854, 
    2341, 5794, 2702
  )

Query time 0.00154

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "58.31"
    },
    "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": 42,
          "rows_produced_per_join": 42,
          "filtered": "100.00",
          "index_condition": "(`softwarepirmam_hewadelivard_cscart_4`.`p`.`product_id` in (2698,3605,5830,2340,5887,3155,3834,2737,3306,5848,2352,2431,5114,2339,3389,2924,1626,3350,3392,5811,3390,2922,5849,5798,3603,2693,2338,5826,5801,5864,5829,3301,5852,5928,5822,5847,5854,2341,5794,2702))",
          "cost_info": {
            "read_cost": "24.71",
            "eval_cost": "4.20",
            "prefix_cost": "28.91",
            "data_read_per_join": "672"
          },
          "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": 42,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "10.50",
            "eval_cost": "4.20",
            "prefix_cost": "43.61",
            "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": 42,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "10.50",
            "eval_cost": "4.20",
            "prefix_cost": "58.31",
            "data_read_per_join": "4K"
          },
          "used_columns": [
            "feature_id",
            "purpose",
            "group_id"
          ]
        }
      }
    ]
  }
}