SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4800af3eb2b41f94b9f7f235e6eaad455e2c391c23db209bea45c56f476fd5ec' 
  AND token = 'KhFJvNpW2N0CNIngeLOB/amx/26vwhrG89NwCZnW5Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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