SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e613cd66a4b9321cee0f82dbbd3fc9553c0ea112ff9bd657234770d6515db37' 
  AND token = 'oAluZ/h9f9lOB+ALKvy9SoJ6GC/OvdPeRAVCmsMf3hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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