SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    20665, 24347, 20664, 24348, 20889, 24349, 
    24350, 20891, 22003, 22004, 22005, 
    22006, 22007, 22008, 22009, 22010, 
    22011, 22012, 22371, 22378, 22372, 
    22379, 22373, 22385
  )

Query time 0.00092

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_products",
          "access_type": "range",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "rows": 24,
          "filtered": 100,
          "index_condition": "cscart_products.product_id in (20665,24347,20664,24348,20889,24349,24350,20891,22003,22004,22005,22006,22007,22008,22009,22010,22011,22012,22371,22378,22372,22379,22373,22385)"
        }
      }
    ]
  }
}