SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36eab7a165946fad76e13e6b6ed7aeb9d931b933cf34b7211b31aa8c4f638f0b' 
  AND token = 'Hn/voCL9qTT+nPu5/B2BAaE8guLW2YrUZNrgEzujKcU=' 
  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"
    }
  }
}