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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de6a4f3c2da3d73b38f87afd32761af00f4f5c6ab9a1de731f4b58712cefb8eb' 
  AND token = '4H5SqfeBd3hjBlo+LASyZxaleuwEXV+W9kfaRL8NKrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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