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 (
    115, 116, 117, 118, 119, 120, 121, 122, 
    123, 124, 125, 126, 127, 128, 129, 130, 
    131, 132, 133, 134, 135, 136, 137, 138, 
    139, 140, 141, 142, 143, 144, 145, 146, 
    147, 148, 149, 150, 151, 152, 153, 154, 
    155, 156, 157, 158, 159, 160, 161, 162
  )

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "g",
      "access_type": "system",
      "possible_keys": ["PRIMARY"],
      "rows": 1,
      "filtered": 100
    },
    "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": ["const"],
      "rows": 2,
      "filtered": 100
    },
    "block-nl-join": {
      "table": {
        "table_name": "p",
        "access_type": "ALL",
        "possible_keys": ["PRIMARY", "idx_group_id"],
        "rows": 7,
        "filtered": 100,
        "attached_condition": "p.group_id = 10 and p.product_id in (115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161,162)"
      },
      "buffer_type": "flat",
      "buffer_size": "1Kb",
      "join_type": "BNL"
    }
  }
}