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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '50d1d9d3bc5f46f3fb3d7ed7a353cd3e32512c5696cb0bf3d00ff4920c31423a' 
  AND token = 'DzrzK8mpOkCyvQz7RcB6JH80jFpt2JqAj17oSxOUI8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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