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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '593f2425c97010b693632d9d142b17d0c54e2b8628a4987302b6f978d4cd400b' 
  AND token = 'dzx3rTOBWFz6dr3L401WzVw2+tVRvypnjF6XhYoEfC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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