SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6019bc120c745fcbfae179f97b765a540b89c0f485fe0208daf146eec8298ad' 
  AND token = 'FuyrvERwnlDYLMrwG7ZqSDhjQaZPvUtmUpdxBzGUaNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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