Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffafbb8479b103606be4de8b225f4f9dd223bfcbd91ac5e9dd25095da8a21124' 
  AND token = '6vjqxawMnLir6vY4xahG5EzGFoKUoxh2TxceRZ8kuGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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