SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '8f36badecf45bfc01a0a48505e84b5dcc6d5b6bd63d84cb2e7b3ad2d8b01192e' 
  AND token = 'LjmPEl3jpBUdbl/jRT9d2DCHVwKQFE9kSN8wUOh1ugY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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