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 (
    5833, 5835, 27363, 3885, 5836, 37305, 
    2566, 38146, 38145, 31652, 6529, 3601, 
    3617, 31651, 31786, 534, 46716, 286, 
    25180, 26846, 1041, 2567, 1835, 46749, 
    729, 227, 33697, 1532, 1838, 1056, 5730, 
    47904
  )

Query time 0.00437

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "p",
          "access_type": "range",
          "possible_keys": ["PRIMARY", "idx_group_id"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "rows": 34,
          "filtered": 100,
          "index_condition": "p.product_id in (5833,5835,27363,3885,5836,37305,2566,38146,38145,31652,6529,3601,3617,31651,31786,534,46716,286,25180,26846,1041,2567,1835,46749,729,227,33697,1532,1838,1056,5730,47904)"
        }
      },
      {
        "table": {
          "table_name": "f",
          "access_type": "ref",
          "possible_keys": ["idx_group_id"],
          "key": "idx_group_id",
          "key_length": "3",
          "used_key_parts": ["group_id"],
          "ref": ["dev_db.p.group_id"],
          "rows": 1,
          "filtered": 100
        }
      },
      {
        "table": {
          "table_name": "g",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["id"],
          "ref": ["dev_db.p.group_id"],
          "rows": 1,
          "filtered": 100
        }
      }
    ]
  }
}