Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17e1bc5892c1cbcc95e9e43958d711d2557a8830efa7585ddb483de472bf7354' 
  AND token = '8yB32hXnzr021SxVJMXTrMVd3lslhoO1PruWS+7BmzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}