Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42e942d0dfc5e3cd0de170882bd96060be700f9fdadc3273ed9b948cc64975a8' 
  AND token = '44cFIKEHZ/twaWSx4cV7W+fujuwMPT9RwU08nR0Jqng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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