Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03cf6229861206098f08b5a7c15e8eee30f395f855573005ce4c4c7ecb916b80' 
  AND token = '3bHHqgOOoo3ptVpd+APzYaza0hIWh0PuE0NAzq7Cesw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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