Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5df168a535fe7ca39ba221408ae3db70abc2d96651f3d97673f408aa4ef30f1' 
  AND token = 'dezSahLwm+0i0sswXnjEoKLxfkMouzOTKomT4yqWjYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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