Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78aa5f3c0aa6e42c611994d58460319e8bb4373e52e17f4a1f98a4ad65db2d48' 
  AND token = '4lAId1LRT9u4y5IrrjCps7g2CiFPqCjQqrSNme0H66A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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