Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2425e5b8d460cd38a421d8acf5a2b6b1cc1ce64a02ec390142e85fee9946171' 
  AND token = 'wTnhwIhHZLmDaDsJLuud7Tqtp2wVJFqDGc2mgtCrE3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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