Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40340cbeadba829f6dc45aefefd3600d7c32d59dd623fff33ce487c103c1c94b' 
  AND token = 'RyEQVK0FYTIVa9YhncPmOtflfqfWOO23TmQ2YxuaCGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}