Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00f90a5e2cbab1791b41ed32d2f990b916a0b20f6e381ea3dd3a7e2226004bd6' 
  AND token = 'KpboWbTjf843JkLRn6QZo+Zaw2MvvnFO8KySRU81Zvs=' 
  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"
    }
  }
}