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 (
    367, 368, 369, 370, 355, 356, 357, 358, 
    359, 360, 361, 362, 352, 353, 354, 350, 
    349, 346, 345, 331, 335, 339, 341, 315, 
    289, 287, 286, 278, 280, 282, 247, 248, 
    241, 244, 245, 246, 240, 6, 66, 166, 214, 
    219, 221, 223, 192, 194, 195, 196, 197, 
    198, 199, 200, 201, 202, 203, 204, 205, 
    206, 207, 208, 209, 210, 211, 212
  )

Query time 0.00085

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "208.61"
    },
    "nested_loop": [
      {
        "table": {
          "table_name": "f",
          "access_type": "ALL",
          "possible_keys": [
            "idx_group_id"
          ],
          "rows_examined_per_scan": 22,
          "rows_produced_per_join": 22,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "2.20",
            "eval_cost": "4.40",
            "prefix_cost": "6.60",
            "data_read_per_join": "2K"
          },
          "used_columns": [
            "feature_id",
            "purpose",
            "group_id"
          ]
        }
      },
      {
        "table": {
          "table_name": "g",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "id"
          ],
          "key_length": "3",
          "ref": [
            "pankajecarter_systemfour.f.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 22,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "22.00",
            "eval_cost": "4.40",
            "prefix_cost": "33.00",
            "data_read_per_join": "8K"
          },
          "used_columns": [
            "id",
            "code"
          ]
        }
      },
      {
        "table": {
          "table_name": "p",
          "access_type": "ref",
          "possible_keys": [
            "PRIMARY",
            "idx_group_id"
          ],
          "key": "idx_group_id",
          "used_key_parts": [
            "group_id"
          ],
          "key_length": "3",
          "ref": [
            "pankajecarter_systemfour.f.group_id"
          ],
          "rows_examined_per_scan": 9,
          "rows_produced_per_join": 218,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "132.00",
            "eval_cost": "43.62",
            "prefix_cost": "208.61",
            "data_read_per_join": "3K"
          },
          "used_columns": [
            "product_id",
            "parent_product_id",
            "group_id"
          ],
          "attached_condition": "(`pankajecarter_systemfour`.`p`.`product_id` in (367,368,369,370,355,356,357,358,359,360,361,362,352,353,354,350,349,346,345,331,335,339,341,315,289,287,286,278,280,282,247,248,241,244,245,246,240,6,66,166,214,219,221,223,192,194,195,196,197,198,199,200,201,202,203,204,205,206,207,208,209,210,211,212))"
        }
      }
    ]
  }
}