Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59bcfe8a0a4951e342073645686a51d72eb01f2e84e1bcbd1fd24f1186f2270c' 
  AND token = 'RvIvM//DauL69aKW0Si/qfPot5amP5+At7K6+Qlm8iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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