Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '5cbb7bbc1de492bf93e08a6a08be7b0643e8fbb2b120e37e28f8f314955fc5fa' 
  AND token = 'htRe8jEhjBEYuNHQIqb3f4acu6FmnOaefhNp+DgTP/Q=' 
  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"
    }
  }
}