Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76349e487d4af0a2e4c0e17cbf940d573fe5fd3ec633c459fe5dcdfa41815f1c' 
  AND token = 'qtZcetfrMBSm2pJAi9afpzds0h7MZw48RSa1BCxGrwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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