SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    2082, 2122, 2198, 2199, 2235, 2247, 2258, 
    2269, 2273, 2319, 2380, 2388
  )

Query time 0.00104

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": 12,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (2082,2122,2198,2199,2235,2247,2258,2269,2273,2319,2380,2388)"
    }
  }
}