Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd17dcdc4b4e001b6b7893449a468289d974bb50f1d3a38b1bd8378d0de63bef3' 
  AND token = 'l5cGd+WqlfvQfTKLWYzStOACS0yR5dxqV5mYzqm9pDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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