Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5e935b92283305d32dd881a9458ef2a5300f254dabfaba25f36e905511fd7f1' 
  AND token = 'HFr2kcCfHZkIjy09eoHbo/FMlhuXUnB4f2rt8QNibm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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