SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b9fdcf663368afa97b325f2f9eb51a9d93f5bd59976ec1e60aa2f23d8ef2b401' 
  AND token = 'YJrcN4ffqakjwtNAriBUrsSjegfGKgCsCIqQITl3EZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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