SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '6e49b65c28865220908ece4af7e276bedeb475b9e17921219aed6973cadb8a8b' 
  AND token = 'ffVYhTz4J+FDed5lay0aG+WTZfKA4GESS6qB3smyoww=' 
  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"
    }
  }
}