Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da3b99c2383f6941612dd692c51e89943ee08ebe0d79bdbcd922e2e53dde7a04' 
  AND token = 'TL7r1QnAtP7byl6D/IuUPT0UdoEUXNUWsjFu8OBtT84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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