Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f033d924753a6bc114fc15bf419a9364e18ba7a2c5470e6932a7c363edf05ae5' 
  AND token = '/N3TDlVr6g9RAeIFB/UfrJwXodmpv0AjifXxmO3u2Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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