Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfb45e777446715abf97d8c24366049851641650641207e4c63f2fe97b1240db' 
  AND token = 'eZPD2SfptSH6C5leUf45dDwNXRRvrzKfMTUFeZ9jkoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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