Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f72acb9cb52c0c5706dc807f95fb3f39d5529abf11576a8b990f48e0480208d' 
  AND token = 'L+Izd7ihgUJUdLeZnE4fNFJKl04VUykIUmWpNlOFe1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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