Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ec515d8a75290331558054c9f8c068bef1f0233e6bc05f3ec57cee033239bf0' 
  AND token = 'LX1bIZ4DGBRxTBa4prvL1ZQuqSQdtEVaMTLHfm5wvA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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