Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '951368a2f947a4b3ac68df595647a0d4b9d4d76464d5df892551172565e1c340' 
  AND token = 'YeO0ma6T6iuRury4QXUsA/vM2Y0jTTLi1O//wAAnEIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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