Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92dbbd60258d80fac69875d333fd4d611315ca8c987f41f3d7bbede1558ad93c' 
  AND token = '4hbwK+fuJfnjXJpjuhFWelwhWjnLpO3SCzUiutEdyns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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