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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d29e677e876ae592e55850e592963468f0a218c0130dfec5edbe96ae563c4f' 
  AND token = 'URqe9A7k3YUtVrct+OyUyi82fFz3HPF8DXqwJmI1QSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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