Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '764a5f0d50e7c02ad776e95f9cdd28f34404a589a230d3f4f0f9809146f4f1a3' 
  AND token = 'gWQWZLv2iC+XWAn/NAakz+UpyYrfXb+4+9lBtR1d2Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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