SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    65705, 65704, 65523, 65584, 65522, 65524, 
    65529, 65590, 65686, 65681, 65672, 
    65673
  )

Query time 0.00070

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,
      "attached_condition": "cscart_products.product_id in (65705,65704,65523,65584,65522,65524,65529,65590,65686,65681,65672,65673)"
    }
  }
}

Result