SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'd5b689958e8427deb1ff433a482796a574e8a5146bdcc7754253de4ef231f2f8' 
  AND token = 'KsLhgcL9CiZkh1HLEVXbjZplIJlNopOJ8QRSP9cdEM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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