SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4285672a5286f195f36a9c2ba6ff19459d17263b1776ceb6eab38a069794f6ea' 
  AND token = 'TH+zuN/X0d9RwtsGPGaXBlYJFzI/d8jQWaicyq0pHuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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