Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb83921bf46a0a287c2bd9db7ec6441f31be048f08e32bd8d61d2e2c0ccf2847' 
  AND token = '1HxCSpm+cXQ/xDPlNj7jRcWAdnOzzPE48omPecCFAoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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