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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '21e94030492e7cdb9d8454587d9671466ae4ec1ac58db8cd6e5a3b2f769575fb' 
  AND token = 'x76AgyclQfN8/srnV40eLLnXVpkg8+72X+M1aOiVzYU=' 
  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"
    }
  }
}