Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '4ff78971f84359b3e975f40b36141a5f59d6f545e328eb4a8d2b877e5182c91c' 
  AND token = '1izpwkyZymAUznM8RyVVjhgoXDO4fu34BHbo1d2f+fE=' 
  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"
    }
  }
}