Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a961f17768553530a77fa27b9cbbd188adda05ff0a1d5d95655f0f10e0fa0644' 
  AND token = 'K4WgILaqXFSCo1d4/AGtRjGMA4kMGZWJ+zSj6d4lLEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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