Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c260806d9476199221b86ec7e00d6ec1f5bf13d23dc0da6634fa58fc63092c80' 
  AND token = 'HMbyay/zsAixekUJqnaJze/5976rO/uXc8HcW4UF4r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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