SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '3d40a9d9da21bbf24879777b4dd07bf4cd182d33ba1e1c643f51700d203ed3a7' 
  AND token = '18XwsinAoVIiZ+jGVF6Yqhd9qmd24s7/UnYyuFmuxow=' 
  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"
    }
  }
}