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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '528d3fd6ff221179142f4b8478a8c3d8c33af134f7f6046de4cd91e369b44489' 
  AND token = 'q8FJVd8p1PqMt3VD88kMT7gqIuh4mfdXc2kij8ShzpE=' 
  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"
    }
  }
}