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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '163cce1ad488602b3f28132a1022b3d7a6c0dfa03a2c422f12752da6554c84e8' 
  AND token = '20xoCV6ppf88V4SWTFx8lxs8w5P0ldSWbk2u2ysAlVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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