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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5566a8cecd84514f75483fcf9bc0212c3500d4e33127b5b69b550cfffb6e62f2' 
  AND token = '/MBX3i7P4l7jE9LP+WmkJXw6iTavoBCEdBF5mIvyNSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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