Sandbox

SELECT 
  1 
FROM 
  cscart_aprilec_print_temp_designs 
WHERE 
  session_id = 'MC98-AQW9-I8XY-5RD6-F9RK-YACM-JOL2-1TIE' 
  AND product_id = 131 
  AND expires_at > 1777131621 
  AND confirmed = 'Y' 
LIMIT 
  1

Query time 0.00029

JSON explain

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