Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d4e0fa6d1a3b074c6f26f7722f0bc37030752b080e262e167c26752c0baddfc' 
  AND token = 'uBed3Rv3Hr5gvJNH1dVsIbUuLzfT/PZ34ZuvkgWh+Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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