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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a257c0ab3f81185b7c1ae456270c85686af6083c82337c7b8beee1893f9fdedd' 
  AND token = 'YZogmBqa0UDXZf5K4yNTULcVGHt1MLVrVIY9VFlKcVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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