SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '2a87c2a1b102868dbd8801696d110e998fb7ac9cb1434a831375c38425fb66a6' 
  AND token = 'xY3g1tMwRXk8zhq/eqWPN9SRCtPvEInUjBohMXJ8DhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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