Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7df479371ca0fcb8476c01c58fe600c468418451c67de7707435551b3085fd12' 
  AND token = 'xo5mKGhdtoobw3LWuyu7PCw77YJC4S1xQcEZxgV+t4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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