Sandbox

SELECT 
  1 
FROM 
  cscart_june_setupec_print_temp_designs 
WHERE 
  session_id = 'S1E6-E4Q7-HWID-X087-OZWW-X5HC-EFPU-WTL4' 
  AND product_id = 128 
  AND expires_at > 1781898376 
  AND confirmed = 'Y' 
LIMIT 
  1

Query time 0.00026

JSON explain

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