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 (
    189, 192, 168, 188, 183, 813, 814, 749, 
    203, 196, 165, 167, 701, 702, 708, 786, 
    221, 166, 184, 751, 856, 193, 789, 791, 
    793, 224, 160, 228, 727, 728, 729, 730, 
    731, 800, 806, 169, 200
  )

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.133160005,
    "nested_loop": [
      {
        "table": {
          "table_name": "p",
          "access_type": "index",
          "possible_keys": ["PRIMARY", "idx_group_id"],
          "key": "idx_parent_product_id",
          "key_length": "3",
          "used_key_parts": ["parent_product_id"],
          "loops": 1,
          "rows": 161,
          "cost": 0.030262205,
          "filtered": 22.98136711,
          "attached_condition": "p.product_id in (189,192,168,188,183,813,814,749,203,196,165,167,701,702,708,786,221,166,184,751,856,193,789,791,793,224,160,228,727,728,729,730,731,800,806,169,200)",
          "using_index": true
        }
      },
      {
        "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": ["u428615623_ecartifygonje.p.group_id"],
          "loops": 37,
          "rows": 1,
          "cost": 0.06898432,
          "filtered": 100
        }
      },
      {
        "table": {
          "table_name": "g",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["id"],
          "ref": ["u428615623_ecartifygonje.p.group_id"],
          "loops": 37,
          "rows": 1,
          "cost": 0.03391348,
          "filtered": 100
        }
      }
    ]
  }
}