SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '878433605458893ec32bb715e09623598e22a4480d8fe65bef2323b9b1f879ea' 
  AND token = 'mUjUSAqnAH25+huyFdyxcrWh94D+XdUz6GF1lRq9ZLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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