Sandbox

SELECT 
  1 
FROM 
  cscart_ec_print_temp_designs 
WHERE 
  session_id = 'PPB9-L0MO-WJZ8-M7CF-9OE1-Z6OK-3V65-R2YM' 
  AND product_id = 225 
  AND expires_at > 1770579214 
  AND confirmed = 'Y' 
LIMIT 
  1

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}