Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f08c7e44b03cce9ff02797b32ee1a868712e5cbbe083826b469dcc06ac537e7c' 
  AND token = 'Si5xQvdtPgNmqhIpcWvx9yHzJbG5+d7dgJtMf0KaPHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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