SELECT 
  product_id, 
  is_stock_split_by_warehouses 
FROM 
  cscart_products 
WHERE 
  product_id IN (
    367, 402, 403, 404, 405, 406, 407, 408, 
    409, 410, 411, 412, 413, 414, 415, 416
  )

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.02861176,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_products",
          "access_type": "range",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "loops": 1,
          "rows": 16,
          "cost": 0.02861176,
          "filtered": 100,
          "attached_condition": "cscart_products.product_id in (367,402,403,404,405,406,407,408,409,410,411,412,413,414,415,416)"
        }
      }
    ]
  }
}