Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '8adf46eef69b69b8fead0d212b909cdcaa07461470977d90c95d2079c415b751' 
  AND token = 'qmaISRwCvZdridXAExXMHVeJt4BPd0swMn34dqID9hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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