Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ec951eb66082f82f86883008b7a78fd535f7c042c1be3e78533ccce37744daf' 
  AND token = 'Iwbw6iXsnohdb0Ffj7rBsm+5WdCb2usQiTseejXxniM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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