Sandbox

SELECT 
  1 
FROM 
  cscart_aprilec_print_temp_designs 
WHERE 
  session_id = 'Y3N1-PJ0P-856D-AZEZ-FJL5-D0XI-XGD8-3C65' 
  AND product_id = 278 
  AND expires_at > 1777394458 
  AND confirmed = 'Y' 
LIMIT 
  1

Query time 0.00056

JSON explain

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