Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'ef18b012cd7c299691ad79e4bad54a0d22e58a3b04da4dd6f46599d452dff67a' 
  AND token = 'kFmI3XkEFlKsyEskv93NYGnTR92bq14xvAZGJDI9IYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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