Sandbox

SELECT 
  1 
FROM 
  cscart_aprilec_print_temp_designs 
WHERE 
  session_id = 'TX1K-38BS-SAGV-W7KI-OBTH-R4DO-Q9YB-G3L4' 
  AND product_id = 137 
  AND expires_at > 1777130830 
  AND confirmed = 'Y' 
LIMIT 
  1

Query time 0.00022

JSON explain

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