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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5ddec6e399d4da2d07434612b968edae8f38cb60669f0f93f09c6a87e4e6e7' 
  AND token = '2jeWVWV2NlwsvvgN5UWBpdq0FWcFpDaB7L3UGgImUbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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