Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f022fe1f86677771205751bd3e72a20b81a4173a8f553dbda93c24a8b8f84e' 
  AND token = 'StQTHUYdCHwrXKZHGuikqWJqDVDFr2KSOYDnKnt4bac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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