Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4671fbb16fc001707dd1710c7457007134f275af378e97bffcf54099f96f4eb8' 
  AND token = 'ClBDY3czWMB+2PRIVAYWqI47yga07yHwR3AyNakhUk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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