SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'fe9e6a4a969d9ebafcb5979d62ded723e2c14868875bdb4825cd9fd57e16cf7f' 
  AND token = 'rLlIkbpJmjVhcvKn0G+Z4iHA+E645Jnnzf1zCf4cAug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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