SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '390852edd7e9af643257ba31d22c61cc356b32313e99b4630545df62bafd6858' 
  AND token = 'ljU+meROzmDNp47YhBQiE9CSBd1QOlwBJHdJNyqMrGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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