Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '888657c82d844b85987dd7e7352c875e99c1c7736a999ffa496d79c9de5ddc6f' 
  AND token = 'hq6evuPaKXCbgk3f82Xpf8MtXKfZYa7G4AA3VrxCunE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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