Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c04e3fd0d5ccd71eecaf1d6e4311c3abc493c6a0e01a1abfcdd1f8349983fba' 
  AND token = 'CNiu7FtY/20xUViCJrZ0MeSbESgkRxrcGLhliYcdoNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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