Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2486d0b108efae2ce23c971b7b9020b4d9d6c208253adf17f6836a5ba250acaa' 
  AND token = 'kjkNr8HypftCHIZBV27r3MTDRnFzf21IxcQHK+BhOdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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