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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a299d37a55c888264d9e5fc8bfe0f651952a94b0c3945c1dc32ba0d1b6d9b6' 
  AND token = 'ZkiTp7WzThrqAa8H6H7dE6+7DBt6aXEo/NeURN5niOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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