SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '48c81984281f6010ef909f6a55c52b7a41edb6c126ead229a4cf2c976574a6a3' 
  AND token = 'VuKhOq3wqGJVspQ8awMWZS2zk5Jv7RzNQuY4++FoZso=' 
  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"
    }
  }
}