SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '4d924dcf91a6471905eee5fa1fe8a37668892896c1b506e63f775ef89d457756' 
  AND token = 'VtLh+HOfm/Cfaq/kSrUJ7RExvTI8jJYzboYnxcvipRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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