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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '09e0ff0b420cf8fffd21d3177eee2fb6c35ce1e73c3cc86f77827baa15d51b9f' 
  AND token = 'kHvV2pkAsg6idqDZDLFrv/tz6sWgrOUh6qP2wUrzbWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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