SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c7e9065bc22a95829a95a7234d6cfe91f4ad26df18c1fc24935fad69778934cd' 
  AND token = '1+kfN608KOH/uqa4oWFeqZuU3RVzIv3N1yolLFApP/w=' 
  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"
    }
  }
}