Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61279b139790e6a7e8d0ee37696b4bae03327be2144040d1ded4ed3ac4ef93d4' 
  AND token = '0XHw496X/Y96RfHXt6aT1TPyBkTflSj9hMENq2x3sZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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