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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '8047766deb71c5a6f8a8b48b77fa16255b566802be7cbaee5a4c7c349c63b9d6' 
  AND token = 'aujx5NxGazNzyywkUUi5nQKgpyIPmFkeblHmt+7y6eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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