Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d4d25eb8e989286e2e9fa3bf2998d554fe730b07ed93c3b1b85298f0ce1713' 
  AND token = 'OYAkkgYzO9hRRhyZNwE5QYwAOIAfxRtvbgOapHjBoQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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