SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '355c8a8a3e69b22e7c35157c0ddf39797bbd08c6bb06e47cf37d8358051c73b9' 
  AND token = 'GOVxmMtV96SU9/OGgSJyP3HzWFXaXsaZUpFLEQIuZFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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