SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '55541c84071e5d28069d34b7f401f83a16bc89f1cadbfefbc867b33756e20528' 
  AND token = '8Ph1K5uuFPv30Tqn9uVk+YAmk+wv/g9FvqhTcCedQo4=' 
  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"
    }
  }
}