SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c407b46fc545a48b6d09ea0bc2ad502decf14a93e96bf706c086696219d5665' 
  AND token = 'Tg0KUpMFw5V+3PJ/Cle5knjXztFYGqhHfJkMfvY5gG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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