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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '213819415f2ab0880fc0bf4ae82e0eb79112947a3d66e5587723a82aecf68575' 
  AND token = 'J/loFiIZKBKhHl6uGybnks7EEyrr37sYTq0kZrWn06M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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