SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2889d5f7bdf7fba7188d36160013e87f32cf466d7414088b04ca21489e241b9a' 
  AND token = 'Sf4IcOf/WPwvzylfQBpBJaBhx9g5DlauSIoKgKAOumk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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