SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46dfe58f869e5c6300e93f135892ead945b57b6b095295dccf916c53c9fac00f' 
  AND token = 'wjSjF1Brvsn/VIbYwBCdpv19UJB2mzOxzSbnXQ4UiC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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