SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    373, 374, 375, 376, 377, 378, 367, 368, 
    369, 370, 371, 372, 379, 380, 381
  )

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_products",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "3",
      "used_key_parts": ["product_id"],
      "rows": 15,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (373,374,375,376,377,378,367,368,369,370,371,372,379,380,381)"
    }
  }
}