SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a65ebfb31c50cd6bf69864e4c6f86a76da272a41f227acc65d6ed31ee15739bc' 
  AND token = 'AMJKFOJhlaOguKlZLz5Jcj/0AqGIBfUPpeBxmamuVTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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