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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bbcf8f6d4d26252d73cb76fe016b62b28461ef8cf49d40f7971769f281d503f' 
  AND token = 'NcVatW/cSWzD/YepuSv0YC26Rsek/KrreUC9Y+L2E9o=' 
  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"
    }
  }
}