Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76dd6214d683b18497f3eaa8c2787090646d65d09bc1d939cde95770cb623609' 
  AND token = 'V9ho+qxliO37EOE+H1YNf/4gNvoKPMrMFkGdHQBfXEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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