SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a37bb405bd479f826a22bbfa71c189582bfe7cb1176fb24530db7f38785a1bfd' 
  AND token = 'ZWwWXUmzn7P/bEVFBW/TcgLoNM5xM0hNtRoTW37Xgqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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