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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '76d76f36a7b3d572f07f9c3d46e6856a5f21593723aea4289226dd64e70f80c8' 
  AND token = 'fEA02XyBOZxJrZYNzrCuLA3NXq8TMZBgRiV7LkEm6MY=' 
  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"
    }
  }
}