SELECT 
  1 
FROM 
  cscart_ec_print_temp_designs 
WHERE 
  session_id = '7DIO-T2SU-BGIH-TMQE-MIFP-WOP0-ZVR5-C5PI' 
  AND product_id = 36 
  AND expires_at > 1770898055 
  AND confirmed = 'Y' 
LIMIT 
  1

Query time 0.00069

JSON explain

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