Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72e437e7dd6eaf22ab06d1a23cac31ad3c5e1b65137b82d7f0f6299f3edcb903' 
  AND token = 'v7+ofOOSFVdA8ftgBvj6xjySsWF2xoE43Wn96GFe0Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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